The team goes to a party for rock star Lila Cheney, who has been dating Sam “Cannonball” Guthrie.
At the party, Sam feels insecure so he succumbs to peer pressure and takes drugs.
Lila is an alien, and it turns out the “kids” pressuring Sam at the party were also aliens who were up to no good, the drugs make Sam go nuts, and the New Mutants fight off the aliens and contain Sam.